Docker vs. VM

VMs are FULL OS with memory and device drivers

• Needs a Hypervisor that manages every OS
• Every OS runs as separate entity from host and uses its own Kernel = HEAVY

Docker vs. VM

• Docker shares single Kernel (of host OS)
  VM uses different kernels
• Docker is lightweight and faster. Uses less resources
  Heavy-weight and uses lot of system resources
• Quick startup and execution within Docker engine
  Slower, Executes within Hypervisor as a separate process

VMs
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Guest OS
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Hypervisor
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Host OS
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Server


Container
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Docker engine
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Host OS
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Server